So, just going off of what's on SpaceX's website[0], Falcon Heavy generates ~5 million pounds of thrust at liftoff, and weighs 3.12 million pounds. Max payload

So, just going off of what's on SpaceX's website[0], Falcon Heavy generates ~5 million pounds of thrust at liftoff, and weighs 3.12 million pounds. Max payload to LEO is ~140,000 lb That implies that acceleration at liftoff is somewhere between 1.53 and 1.6g, which would be fine for humans. Further into the launch, I assume it's accelerating way faster than what humans can handle, but human limits wouldn't explain what it looks like anywhere where you can use the ground or apparent distance as a point of reference for speed and acceleration. According to the Source of All Truth[1], Saturn V generated 7.6 million pounds of thrust, and had a launch weight of 5.1 million pounds. That means that, with no payload, it would accelerate at 1.49G. Meaning that the maximum possible acceleration is less than what you'd get with a fully loaded Falcon Heavy. But that's not enough slower to be clearly visible. So I got no idea. Maybe it's some sort of perspective thing, or camera angles? [0]: https://www.spacex.com/falcon-heavy https://www.spacex.com/falcon-heavy [1]: You can figure out the URL